Join best friends Hanna and Tom for a breathtaking underwater journey in Grenada, where real coral reefs meet magical secrets! On their first snorkelling trip, Hanna and Tom discover that not all reefs are bright and colourful - parts of the coral are fading to grey. When Hanna uncovers a glowing shell pendant hidden among the coral, it awakens Kaia, a wise sea turtle who guards the ocean's heart. Kaia reveals that the reef's magic is dying, and only by returning the pendant to the Heart Coral before sunset can its beauty be restored. But a sudden storm, swirling currents, and a race against time test Hanna and Tom's courage - and show them that teamwork and kindness are the most powerful treasures of all. Perfect for children aged 4-12, this enchanting story blends real-world nature and ocean facts with gentle fantasy and adventure, encouraging care for the environment and love for the sea.